Piston with Con-rod, Remove and Install
Remove, Disconnect
Remove cylinder heads - see operation "Cylinder Heads, Remove and Install".Remove oil baffle plate - see operation "Oil Baffle Plate. Remove and Install".
Mark sequence of con-rod bearings caps - bead (1) on con-rod bearing cap point towards flywheel side. Remove con-rod bearing cap from con-rod.
Important!
The mating surfaces of the cod-rods and the con-rod bearing caps form an individual fit and asa result must not be damaged or replaced under any circumstances. To avoid damage, do not lay con-rods ,and con-rod bearing caps on mating surfaces.Remove, Disconnect
Remove combustion residue from upper part of cylinder bore. Use hammer handle to carefully push piston and con-rod upwards from cylinder bore.
Clean.
Clean and check all parts, replace if necessary.Important!
For X 25 XE and Y 26 SE. the piston pin is pressed into the con-rod. Pushing out of the piston pin is not permitted If the piston, the piston pin or the con-rod is detective all above-mentioned parts must be replaced.Install, Connect
Insert new piston rings with identification "TOP" on top in piston using piston ring pliers Note position of piston ring gaps!1 2nd compression ring
2 Steel band ring (oil scraper ring - upper)
3 Steel band ring (oil scraper ring - lower)
4 1st compression ring
5 Intermediate ring (oil scraper ring)
Important!
Contact surfaces (1) and (2) of con-rod and con-rod bearing cap must be clean and in perfect condition If contact surfaces are damaged then the piston and con-rod must be replaced since perfect fit can no longer be ensured.Clean contact surfaces with compressed air
Adjust
Set con-rod journal of crankshaft to BDC position before installation of the piston with con-rod and lightly coat with engine oil.Lightly coat piston rings with engine oil and compress with piston ling compressor Carefully push pistons and con-rod into cylinder bore hole with hammer handle.
Important!
Note installation position - arrow (3) on piston head points to engine timing side.Install, Connect
Note sequence of con-rod bearing caps.Attach con-rod bearing cap to con-rod with new fastening bolts - bead (1) on con-rod bearing cap points to flywheel side -tightening torque 35 Nm . 26 Ibf. ft. + 45: + 15:.
Install oil I baffle plate - see operation "Oil Baffle Plate. Remove and Install".
Install cylinder heads - see operation "Cylinder Heads, Remove and Install"."
